Electronic Dice Circuit

Schematic

Parts

Part Total Qty. Description Substitutions R1, R5, R6 3 22K 1/4W Resistor R2 1 10K 1/4W Resistor R3 1 4.7K 1/4W Resistor R4 1 150K 1/4W Resistor R7 - R13 7 330 Ohm 1/4W Resistor C1 1 1uF Electrolytic Capacitor C2 1 4.7uF Electrolytic Capacitor D1 1 1N4148 Signal Diode D2 - D8 7 Red/Green/Yellow LED Q1 1 2N3904 NPN Transistor U1 1 555 Timer IC U2 1 74LS192 4 Bit Counter IC U3 1 74LS08 Quad Intengreted AND Gate IC S1 1 SPST Momentary Pushbutton Switch MISC 1 Board, Wire, Sockets For ICs, Case Notes Pushing and holding S1 causes the LEDs to rapidly cycle. Releasing the button locks the pattern and shows a number from 1 to 6. When building the circuit, make sure to position the LEDs as shown on the schematic. Otherwise the pattern of the dice will look weird. Two circuits can of course be both powered by one switch to make a dual dice.